[Bldg-sim] Fresh air calculation for naturally ventilatedbuilding

[Aaron Smith]

Sadaf,

 

ASHRAE 62 has three paths of compliance:



1.	The Ventilation Rate Procedure (VRP) is a prescriptive option which
means looking up airflow rates in the tables and doing some calculations.
This is the most common path but would normally apply to mechanically
ventilated buildings.
2.	The Indoor Air Quality (IAQ) procedure is performance based which
requires a Mass Balance Analyses (can be done through modeling).  There was
a recent article about this in the June ASHRAE Journal if you are a member.
This can apply to natural or mechanically ventilated buildings.
3.	The Natural Ventilation Procedure (NVP) which states specific
requirements for opening areas. 

 

I believe LEED generally requires you to follow the VRP or NVP but my LEED
2009 says you can show compliance with "acceptable engineering calculations
or multi-nodal bulk airflow simulation" which I think means following the
IAQ procedure.


Aaron

 

Aaron Smith, P.Eng 

LEEDR AP BD+C, M-ASHRAE, Mechanical Engineer



t: (902) 422-7393

f: (902) 423-4945

e:  <mailto:asmith at mreng.ca> asmith at mreng.ca

 

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From: Chris Yates [mailto:chris.malcolm.yates at gmail.com] 
Sent: Thursday, September 13, 2012 2:21 PM
To: sadaf; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Fresh air calculation for naturally
ventilatedbuilding

 

Sadaf,

I did this on a LEED platinum project a while back. I recall that we had to
invoke a couple of clauses in ASHRAE 62.1 to allow us to use thermal
modelling with CO2 as the metric (at the time 62.1 only had a very basic
natural ventilation rule of thumb such as minimum distance between occupants
and openings). IES was used for the analysis, but you could use any thermal
modelling program that incorporates network air flow (e.g. E+, TAS, IDA).

Without being able to get access to the latest 62.1 I can't help further -
sorry.

You might have trouble meeting ASHRAE 55, depending on your climate.

Hope this helps.

Chris

On 13/09/2012 15:18, sadaf wrote:

Hello all of you,

Can anyone share his/ her knowledge that how to do fresh air calculation for
a naturally ventilated building for IEQ pre - requisite. Any suggestions or
example ,would be highly appreciated.



 

Thanking you all in advance!

 Ms. Sadaf Alam

 

 

 

 

 

 







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